I'm a new user having just installed Ubuntu 12.10. I'm getting along well, but something is bugging me. I keep missing notifications which is getting me in trouble. Is there a way to make notifications / events more persistent? In Windows, for example, the taskbar flashes until I click it. In Android an icon stays in the taskbar until I tap or swipe it away. Regardless of the app.

Is there something similar I can do with Unity? Make the app icon flash when something happens?

Just tested on 12.10 - works and it is awesome. But a log out is required (edited the answer). And a clarification for anyone else confused: recent-notifications in the PPA is the package for gnome-panel (Classic Gnome), so for Unity, the instructions in the answer are correct. The Unity version will show only five notifications, if there are more notifications, it will eventually show them all once you delete newer ones.
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pileofrocksMar 6 '13 at 16:12